Make pca953x driver use the simple irq handler since no hardware control
is necessary and the driver lacks an irq_ack function. handle_edge_irq()
calls chip->irq_ack() which crashes since this function does not exist.
Signed-off-by: NErik Botö <erik.boto@pelagicore.com>
Signed-off-by: NRichard Röjfors <richard.rojfors@pelagicore.com>
Signed-off-by: NGrant Likely <grant.likely@secretlab.ca>